/*
 * Copyright 2002-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Reflection;
using AopAlliance.Intercept;

namespace Spring.Transaction.Interceptor;

/// <summary>
/// An AOP Alliance <see cref="AopAlliance.Intercept.IMethodInterceptor"/> providing
/// declarative transaction management using the common Spring.NET transaction infrastructure.
/// </summary>
/// <remarks>
/// <p>
/// That class contains the necessary calls into Spring.NET's underlying
/// transaction API: subclasses such as this are responsible for calling
/// superclass methods such as
/// <see cref="Spring.Transaction.Interceptor.TransactionAspectSupport.CreateTransactionIfNecessary(MethodInfo, Type) "/>
/// in the correct order, in the event of normal invocation return or an exception.
/// </p>
/// <p>
/// <see cref="Spring.Transaction.Interceptor.TransactionInterceptor"/>s are thread-safe.
/// </p>
/// </remarks>
/// <author>Rod Johnson</author>
/// <author>Juergen Hoeller</author>
/// <author>Griffin Caprio (.NET)</author>
/// <author>Mark Pollack (.NET)</author>
[Serializable]
public class TransactionInterceptor : TransactionAspectSupport, IMethodInterceptor
{
    /// <summary>
    /// AOP Alliance invoke call that handles all transaction plumbing.
    /// </summary>
    /// <param name="invocation">
    /// The method that is to execute in the context of a transaction.
    /// </param>
    /// <returns>The return value from the method invocation.</returns>
    public object Invoke(IMethodInvocation invocation)
    {
        // Work out the target class: may be <code>null</code>.
        // The TransactionAttributeSource should be passed the target class
        // as well as the method, which may be from an interface.
        Type targetType = (invocation.This != null) ? invocation.This.GetType() : null;

        // If the transaction attribute is null, the method is non-transactional.
        TransactionInfo txnInfo = CreateTransactionIfNecessary(invocation.Method, targetType);
        object returnValue = null;

        try
        {
            // This is an around advice.
            // Invoke the next interceptor in the chain.
            // This will normally result in a target object being invoked.
            returnValue = invocation.Proceed();
        }
        catch (Exception ex)
        {
            // target invocation exception
            CompleteTransactionAfterThrowing(txnInfo, ex);
            throw;
        }
        finally
        {
            CleanupTransactionInfo(txnInfo);
        }

        CommitTransactionAfterReturning(txnInfo);
        return returnValue;
    }
}
